The 25-year-old McGuire has struggled at Buffalo this season to the tune of a 3-5 record and 5.56 ERA with 57 hits and 23 walks allowed in 55 innings.
Jackson has struggled recently with 38 earned runs allowed in his last 47 innings covering nine starts. He is 1-6 during that stretch and owns a disturbing 5.68 ERA on the season.
Manship has never compiled an ERA lower than 5.28 in six big-league seasons and owns a 6.65 ERA this year.
Cozart will hope to heat up upon his return. He has four hits in his last 32 at-bats and hasn't homered since June 1.
Cardinals starting catcher Yadier Molina and Baltimore counterpart Matt Wieters are out for the season. Suzuki has proven to be one of the premier clutch hitters among major league catchers this season. He boasts a strong stat line of .308/.367/.393 while playing quite well behind the plate.
Hahn was sent down prior to the All-Star break in order to stay on schedule. He made one start at Double-A San Antonio, tossing two scoreless innings.
Peterson got the call just before the All-Star break but appeared in just two games for the Padres. He walked in his lone plate appearance before being sent down.
A still-ailing thumb and inability to consistently hit breaking balls have resulted in a power outage for
Hamilton has just three home runs in 45 games since returning from the thumb injury that landed him on the disabled list. He is also batting .200 on the season against curveballs - 47 points below the league average. Hamilton has whiffed on 49 percent of his swings against curveballs and 22 of his 42 plate appearances that ended on a curve resulted in a strikeout.
He owned a .741 slugging percentage before his injury and .382 since.
The 29-year-old Petit has 54 major league at-bats and has posted a .278 average, but has not played at that level since 2010 with Oakland.